自适应下垂控制的三电平DC/DC变换器并联均流方法研究
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摘要
分析传统下垂控制的三电平DC/DC变换器多模块并联均流电压偏差较大,且各并联模块功率不均分的原因,提出了一种自适应下垂控制的三电平DC/DC变换器多模块并联均流控制方法。通过实时采集各并联变换器的电压和电流,建立变换器下垂系数与负荷功率之间的数学模型,自适应调整下垂系数使直流母线电压跟随给定值。构建直流微电网仿真模型,在相同工况下利用MATLAB/Simulink软件平台,仿真分析传统下垂控制和自适应下垂控制对三电平DC/DC变换器多模块并联直流母线电压降落和功率分配进行对比分析,验证了自适应下垂控制对三电平DC/DC变换器多模块并联的可行性,实现了不同额定功率的三电平DC/DC变换器间的"功率均分",同时极大地改善了由于线路阻抗导致的电压降,提高了直流母线的电能质量。
Based on the analysis of the reasons that the voltage deviation of the conventional three-level DC/DC multimodule parallel current sharing method is large and the power of each parallel module is not power sharing,the adaptive droop of parallel current sharing method for three-level DC/DC is proposed in this paper. By collecting the voltage and current of each parallel converter in real time,the mathematical model between the droop coefficient of the converter and the load power is established,and the droop coefficient is adjusted adaptively to make the DC bus voltage follow the given value. The simulation model of DC micro power grid is built under the same conditions using MATLAB/Simulink software platform,the simulation analysis of traditional drooping droop control and adaptive control method of three-level DC/DC module in parallel DC bus voltage drop and power allocation were analyzed,the feasibility of the sagging adaptive droop control method for three-level DC/DC converter in parallel with multi-modules is verified,and the power sharing between the three-level DC/DC converters with different power ratings is realized,as well as greatly improves the voltage drop caused by the line impedance,and enhances the power quality of DC bus.
Based on the analysis of the reasons that the voltage deviation of the conventional three-level DC/DC multimodule parallel current sharing method is large and the power of each parallel module is not power sharing,the adaptive droop of parallel current sharing method for three-level DC/DC is proposed in this paper. By collecting the voltage and current of each parallel converter in real time,the mathematical model between the droop coefficient of the converter and the load power is established,and the droop coefficient is adjusted adaptively to make the DC bus voltage follow the given value. The simulation model of DC micro power grid is built under the same conditions using MATLAB/Simulink software platform,the simulation analysis of traditional drooping droop control and adaptive control method of three-level DC/DC module in parallel DC bus voltage drop and power allocation were analyzed,the feasibility of the sagging adaptive droop control method for three-level DC/DC converter in parallel with multi-modules is verified,and the power sharing between the three-level DC/DC converters with different power ratings is realized,as well as greatly improves the voltage drop caused by the line impedance,and enhances the power quality of DC bus.
引文
[1]江晨.直流微网中DC/DC变流器并联技术研究[D].北京:北京交通大学,2016.
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[9]周奇勋,张红,曹世宏,等.基于改进下垂法的微电网逆变器并联控制技术[J].电力系统及其自动化学报,2018,30(8):25-31.Zhou Qixun,Zhang Hong,Cao Shihong,et al.Parallel control technology of micro-grid inverter based on improved droop method[J].Journal of Power System and Automation,2018,30(8):25-31.
[10]徐玉琴,马焕均.基于改进下垂控制的逆变器并联运行技术[J].电力系统保护与控制,2015,43(7):103-107.
[11]何海洋,姚刚,邓焰,等.一种三电平交错并联Boost变流器[J].电工技术学报,2006,21(6):23-24.
[2]翟盼盼,苟军年,杨剑锋.基于自适应下垂法的有功功率均分控制[J].电测与仪表,2019,56(10):105-110.Zhai Panpan,Gou Junnian,Yang Jianfeng.Active power sharing control based on adaptive droop method[J].Electrical Measurement&Instrumentation,2019,56(10):105-110.
[3]钱鹏,刘国海,陈兆岭,等.自消除中点电位波动的NPC三电平并联有源滤波器[J].电测与仪表,2014,51(7):65-69.Qian Peng,Liu Guohai,Chen Zhaoling,et al.NPC Three-Level Shunt Active Filter with Neutral-Point Potential Fluctuation Self-Elimination[J].Electrical Measurement&instrumentation,2014,51(7):65-69.
[4]吴振奎,耿云涛,张继红,等.基于“虚拟负阻抗”的微网逆变器并联运行研究[J].电测与仪表,2019,56(10):21-26.Wu Zhenkui,Geng Yuntao,Zhang Jihong,et al.Research on virtual negative impedance control of micro-grid inverters in parallel operation[J].Electrical Measurement&Instrumentation,2019,56(10):21-26.
[5]杨旭红,何超杰.微电网多逆变器运行的自适应下垂控制新策略[J].电测与仪表,2017,54(4):45-49.Yang Xuhong,He Chaojie.New adaptive droop control strategy for micro grid multi-inverter operation[J].Electrical Measurement&Instrumentation,2017,54(4):45-49.
[6]孙孝峰,杨雅麟,赵魏,等.微电网逆变器自适应下垂控制策略[J].电网技术,2014,38(9):2386-2391.Sun Xiaofeng,Yang Yalin,Zhao Wei,et al.Adaptive droop control strategy of microgrid inverter[J].Power Grid Technology,2014,38(9):2386-2391.
[7]谢玲玲,时斌,华国玉,等.基于改进下垂控制的分布式电源并联运行技术[J].电网技术,2013,37(4):992-998.Xie Lingling,Shi Bin,Hua Guoyu,et al.Parallel operation technology of distributed power supply based on improved droop control[J].Power Grid Technology,2013,37(4):992-998.
[8]张庆海,彭楚武,陈燕栋,等.一种微电网多逆变器并联运行控制策略[J].中国电机工程学报,2012,32(25):126-132.Zhang Qinghai,Peng Chuwu,Chen Yandong,et al.A parallel operation control strategy for multiple inverters of micro grid[J].Chinese Journal of Electrical Engineering,2012,32(25):126-132.
[9]周奇勋,张红,曹世宏,等.基于改进下垂法的微电网逆变器并联控制技术[J].电力系统及其自动化学报,2018,30(8):25-31.Zhou Qixun,Zhang Hong,Cao Shihong,et al.Parallel control technology of micro-grid inverter based on improved droop method[J].Journal of Power System and Automation,2018,30(8):25-31.
[10]徐玉琴,马焕均.基于改进下垂控制的逆变器并联运行技术[J].电力系统保护与控制,2015,43(7):103-107.
[11]何海洋,姚刚,邓焰,等.一种三电平交错并联Boost变流器[J].电工技术学报,2006,21(6):23-24.